Belmont Filters construction, 1903
Finished Upper Roxborough filters, 1903
Upper Roxborough filter beds under construction, July 1902
A.C. Abbott, MD
Rudolph Hering
Outhouse over the Schuylkill near Pottstown
McConnell Germ-Proof Filters ad
Bureau of Water Spring Garden Testing Station, 1901
Northern Liberties and Spring Garden Water Works
Apparatus for testing model turbine wheels used at Fairmount, 1859-60